Wisconsin
Grant County drinking water quality
90 active public water systems serve 41,678 people in Grant County. 46 are compliant, 44 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
28 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Platteville Waterworks Platteville |
12,268 | 0 | 0 | |
|
Lancaster Waterworks Lancaster |
3,907 | 0 | 0 | |
|
Boscobel Waterworks Boscobel |
3,237 | 0 | 0 | |
|
Fennimore Waterworks Fennimore |
2,507 | 2 | 2 | |
|
Cuba City Waterworks Cuba City |
2,141 | 3 | 1 | |
|
Muscoda Waterworks Muscoda |
1,453 | 0 | 0 | |
|
Hazel Green Waterworks Hazel Green |
1,193 | 3 | 1 | |
|
Dickeyville Waterworks Dickeyville |
1,069 | 1 | 0 | |
|
Cassville Waterworks Cassville |
777 | 1 | 1 | |
|
Montfort Waterworks Montfort |
718 | 3 | 2 | |
|
Potosi Waterworks Potosi |
718 | 2 | 0 | |
|
Bloomington Waterworks Bloomington |
682 | 0 | 0 | |
|
Livingston Waterworks Livingston |
664 | 0 | 0 | |
|
Kieler SD NO 1 Kieler |
560 | 2 | 1 | |
|
Blue River Waterworks Blue River |
424 | 1 | 1 | |
|
Tennyson Waterworks Potosi |
367 | 2 | 0 | |
|
Bagley Waterworks Bagley |
353 | 1 | 0 | |
|
Sinsinawa Dominicans INC Sinsinawa |
213 | 1 | 1 | |
|
Mount Hope Waterworks Mount Hope |
181 | 2 | 0 | |
|
Patch Grove Waterworks Patch Grove |
160 | 0 | 0 | |
|
Stitzer Sanitary Dist 1 Stitzer |
150 | 4 | 2 | |
|
Maryville SD 2 Hazel Green |
100 | 2 | 1 | |
|
Oak Park Community Platteville |
90 | 4 | 1 | |
|
Cozy Acres MHP Boscobel |
80 | 0 | 0 | |
|
Patriot Park Platteville |
80 | 0 | 0 | |
|
Bluffside Court Cassville |
40 | 2 | 1 | |
|
Stateline Mobile Home Park Hazel Green |
37 | 4 | 1 | |
|
River Vista Estates LLC Potosi |
30 | 3 | 1 |
Non-community systems (62: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (121, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wisconsin records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.